Wiha 28395 Insulated SlimLine Precision Pop Up Screwdriver Set, Slotted/Phillips, 7-Piece SlimLine blades are up to 33% narrower than standard insulated screwdrivers Blades made from Wiha CRM-72 tool steel super hardened and tempered for long-life performance Cushion grip handle with quick release locking blade holder Rotating cap allows palm pressure turning for full blade exposure 10,000 volt tested for insulation integrity, OSHA compliant